1. P. Paolucci - I.N.F.N. of Napoli 1 RPC workshop, 2 march 07 RPC Power system P. Paolucci, G. Polese and D. Lomidze I.N.F.N. di Napoli

2. P. Paolucci - I.N.F.N. of Napoli 2 RPC workshop, 2 march 07 Power Sector Schematic 6 FEBs / 2 bi-gaps 6+6+6 FEBs / 3 bi-gaps 6 FEBs / 2 bi-gaps 1+1 HV 1 HV 2 LV 6+6 FEBs / 2 bi-gaps 12 LV channels 8 HV channels 6+6 FEBs / 2 bi-gaps 1 HV 2 LV boardchannel HV80480 LV60720

3. P. Paolucci - I.N.F.N. of Napoli 3 RPC workshop, 2 march 07 Power Wheel Schematic Detector 1 2 12 11 109 8 7 6 5 43 Control Room SY1527 RPCLVpanelHVpanelHVRPCLVRPCLVRPCLV HV distributor 1 in – 2 out HV-EASY HV distributor 1 in – 2 out HV-EASY

4. P. Paolucci - I.N.F.N. of Napoli 4 RPC workshop, 2 march 07 HV and LV Components HV in control room – LV on detector HV 1 HV channel per chamber 80 HV boards  480 channels 6 HV racks – 14 EASY crates – 2 MAOs LV 1 analog + 1 digital LV channel per chamber 60 LV boards  760 channels 20 EASY crate on balcony – 2 crates per tower

5. P. Paolucci - I.N.F.N. of Napoli 5 RPC workshop, 2 march 07 Project Cost HV and LV tenders in the 2003 Cable tenders in the 2004 HV and LV connectors bought in the 2004 HardwareEquipmentCablingTOT HV300 K€ 140 K€ 60 K€ 500 K€ LV230 K€ 14 K€ 16 K€ 260 K€

6. P. Paolucci - I.N.F.N. of Napoli 6 RPC workshop, 2 march 07 Power Dissipation Numbers HV:480 ch · 1 watt  0.5 KW LV:760 ch · 14 watt  10 KW MAO:26 ch · 2 KW  60 KW TOTAL  70 KW about 10 €/watt

7. P. Paolucci - I.N.F.N. of Napoli 7 RPC workshop, 2 march 07 What we learned during MTCC 1.Cabling is complex and the debug is not easy: Lot of cables and connections (few broken) Tower are difficult to access 2.LV system worked in a stable way and without any faults 3.HV boards had instability problems related to the current monitoring (Imon)

8. P. Paolucci - I.N.F.N. of Napoli 8 RPC workshop, 2 march 07 Imon instability in 1 th MTCC period POWER CYCLE

9. P. Paolucci - I.N.F.N. of Napoli 9 RPC workshop, 2 march 07 HV Imon test with Resistors at 904 31 c 20 c WITH FAN UNIT WITHOUT FAN UNIT

10. P. Paolucci - I.N.F.N. of Napoli 10 RPC workshop, 2 march 07 BOARD 1 CH0/1 BOARD 1 CH2 BOARD 2 CH0/1 BOARD 3 CH0/1 BOARD 3 CH2 BOARD 4 CH0/1 NO FAN-31C FAN-20C POWER CYCLE B2 CHO/1 HV power cicle test with Resistors at BLG 904

11. P. Paolucci - I.N.F.N. of Napoli 11 RPC workshop, 2 march 07 Sotware and Hardware Reset test SW HW

12. P. Paolucci - I.N.F.N. of Napoli 12 RPC workshop, 2 march 07 I0set influences Imon readout I0 changed from 800 microA to 750 microA

13. HV instability conclusion/news 1.We were able to reproduce the instability effect at BLG 904 using resistive charge  problem is not related to the detector/cable 2.Measuring independently the current on the ground wire we understood the instability was on the monitored current (Imon) and not on the generated current. 3.The increase let us suspect to a thermal drift of some components and so we begin to use the CAEN fan unit to ventilate the boards. 4.Using the fans the board temperature went down from 31 o C to 20 o C and for 6 days Imon was very stable but increased on the 7 th 5.The  of the Imon distribution of the ventilated boards is 0.2  A and it was twice without fan. 6.Hardware power cycle of any board present in the EASY crate affect the offset of all the boards in the crate. A new firmware from CAEN is almost read synchronization problem have been fixed !!! No news for thermal drift

14. P. Paolucci - I.N.F.N. of Napoli 14 RPC workshop, 2 march 07 HV & LV delivery

15. P. Paolucci - I.N.F.N. of Napoli 15 RPC workshop, 2 march 07 Components - numbers modelloordinaticonsegnatimancanti SY1525220 A3485 - MACISTE312 A3512N - HV804733 BC A1676770 A3000 - CRATE34 0 A3000FB - FAN14 0 A3486S - MAO505 A3009 - LV60573 To modify Late delivery

16. P. Paolucci - I.N.F.N. of Napoli 16 RPC workshop, 2 march 07 HV installation in control room (6 racks) is underway. W+1 and W+2 are OK. Local cable will be prepared and installed in March HV multi-conductor cables will be connected by the CPE company and tested by Napoli people starting from March the 19th. CAEN fixed the synchronization problems (Software) but is still working on the HV board thermal instability. Do we have to send back all the boards ? HV commissioning of W+1 and W+2 will begin when the cable will be ready (end of March) Cable connection on the feet from April (W+1 and W+2) Full system ready for July HV status

17. P. Paolucci - I.N.F.N. of Napoli 17 RPC workshop, 2 march 07 HV installation in CR 12 multiconductors cable per rack (wheel) – 1 x sector The cable positioning is a very hard and difficult job

18. P. Paolucci - I.N.F.N. of Napoli 18 RPC workshop, 2 march 07 HV installation in CR 6 cable per side in order to leave center accessible

19. P. Paolucci - I.N.F.N. of Napoli 19 RPC workshop, 2 march 07 LV system in W+1 and W+2 is OK boards tested and cabled local connection ready LV tower cabling is finished this week in W+1 and W+2, including LV trigger and MAO cables. LV patch pannels and distributors not ready (central CMS LV project) LV commissioning of W+1 and W+2 will begin in March 2007. Full system ready for July LV status

20. Schedule MarchAprilMayJuneJulyAugust HV delivery Multic. Cable inst CPE company Tech. Multic. Cable test Phys. HV commis. MAO from CMS W+1 W+2W0W-1 W-2Full system test LV delivery LV commis. MAO from CMS W+1 W+2W0W-1 W-2Full system test MAO delivery

21. P. Paolucci - I.N.F.N. of Napoli 21 RPC workshop, 2 march 07 HV commissioning: G. Polese, D. Lomidze, P. Paolucci HV multicond. test: P. Noli, D. Lomidze LV commissioning: G. Polese, D. Lomidze, P. Paolucci, F. Loddo, M. Kudla LV cable test: G. Passeggio, A. Vanzanella HV endcap: Pakistan + ? HV multicond. test: J. Crotty + ? LV endcap: Pakistan + ? People

22. P. Paolucci - I.N.F.N. of Napoli 22 RPC workshop, 2 march 07 Conclusion We still have few missing hardware components (tenders in the 2003 and 2004) MAOs is a real problems: we hope to get 2 MAOs and 1 majiste for commissioning the wheel and the power systems The CMS LV central system is not ready: feet patch panels have been mounted by us but there are still missing components balcony patch panel ? long run cables ? And patch panels connections ? Manpower and schedule is OK in the barrel